Hi folks,

I just committed a change which allows m68k ddb's trace command to show
stack tracebacks for any non-swapped-out process in the system. This is
enabled using the `/t' modifier to the trace command, followed by the PID
of the process you're interested in.

The code has only been tested on mvme68k, but from the looks of all the
other m68k ports' `cpu_switch()' function and `struct pcb' usage, it
should work everywhere.

Testers for the other m68k ports are required. ;-)

Cheers, Steve